Re: [net PATCH 1/2] selftests: net: lib: fix broken ping with coreutils ping util

[Christian Marangi <ansuelsmth@gmail.com>]

On Mon, Dec 02, 2024 at 11:24:29PM +0200, Vladimir Oltean wrote:
> On Mon, Dec 02, 2024 at 09:39:15PM +0100, Christian Marangi wrote:
> > Mhh the problem seems to be -c 
> > 
> > Let me post some outputs...
> > 
> > root@OpenWrt:~# ping -V
> > ping from iputils 20240117
> > libcap: no, IDN: no, NLS: no, error.h: no, getrandom(): yes, __fpending(): yes
> > root@OpenWrt:~# ping -c 10 192.168.1.1
> > PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
> > 64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.102 ms
> > 64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.084 ms
> > 64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.236 ms
> > ^C
> > --- 192.168.1.1 ping statistics ---
> > 3 packets transmitted, 3 received, 0% packet loss, time 2080ms
> > rtt min/avg/max/mdev = 0.084/0.140/0.236/0.067 ms
> > root@OpenWrt:~# ping 192.168.1.1 -c 10
> > ping: -c: Name does not resolve
> > 
> > As you can see swapping the ip cause this "Name does not resolve" error.
> 
> Ok, I opened the iputils source code and there isn't any relevant recent
> change there. But it uses getopt(3), and that seems to be implemented
> more simplistically for musl libc:
> https://wiki.musl-libc.org/functional-differences-from-glibc.html
> "musl and the POSIX standard getopt stop processing options at the first
> non-option argument with no permutation."
> 
> On GNU libc:
> $ ping 192.168.1.1 -c 1
> PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
> 64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.696 ms
> 
> --- 192.168.1.1 ping statistics ---
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> rtt min/avg/max/mdev = 0.696/0.696/0.696/0.000 ms

Well it's definitely that... As we use musl as glibc is BIIIG and won't
ever fit 4mb of flash ahahha

Also I just notice msend suffer the very same problem...

root@OpenWrt:~# ip vrf exec vlan1 msend -g ff2e::0102:0304 -I lan1 -c 1
Now sending to multicast group: [ff2e::0102:0304]:4444
sendto: Address family not supported by protocol
root@OpenWrt:~# ip vrf exec vlan1 msend -I lan1 -c -g 1ff2e::0102:0304
Now sending to multicast group: [224.1.1.1]:4444
Sending msg 1, TTL 1, to [224.1.1.1]:4444:
Sending msg 2, TTL 1, to [224.1.1.1]:4444:

-- 
	Ansuel